Create args.sh in $ETCPREFIX/etc/ax/ for pass args to xinit, for example:
#!/bin/sh
# printf "%s" "xinit args"
return 0

Create post.sh in $ETCPREFIX/etc/ax/ for execute command after xinit, for
example:
#!/bin/sh
return 0

Create script.sh in $ETCPREFIX/etc/ax/ for program that will be executed to
.xinitrc, for example:
#!/bin/sh
#Read .Xresources
if [ -f ~/.Xresources ]; then
	xrdb ~/.Xresources
fi

#If select openbox run tint2
if [ "$1" = "openbox" ]; then
	tint2 &
fi

